Improvement in saw-gummers



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UNITED STATES PATENT- OFFICE.

MARVIN 0. SMITH, OF NEW BUFFALO, MICHIGAN, ASSIGNOR TO ISAAC O.

' SMITH, OF SAME PLACE.

IMPROVE'MENT IN 'SAW-GUMMERS.

Specification forming part of Letters Patent No. 166,3] 3, dated August3, 1875; application filed February 3, 1875.

To all whom it may concern: face of the ring. A portion of the flangesare Be it known that I, MARVIN O. SMITH, of removed at 11, this beingnecessary, as the New Buffalo, in the county of Berrien and jaws areplaced on the ring at this point, and State of Michigan, have invented anew and the flange a enters the dovetail grooves a, useful Improvementin Saw-Gumming Maand the jaws are then moved to any point de chines; andI hereby declare the following to sired on the ring, and secured inposition by be a full, clear, and exact description thereof, forcing thesetscrews 1) against the periphery which will enable others skilled inthe art to of the ring. B is a carriage-way, provided which my inventionrelates to make and use with the slides c, and carrying the cross-headthe same, reference being had to the accom- B; (J, arbor carrying thecutter G. The arpanying drawings, forming part of this specibor issecured in boxes 0, attached to and a fication, in which part of thecross-head B. The arbor is pro- Figure l is a perspective view Fig. 2,top. vided with screw-threads, that engage the View; Fig. 3, rear View;Fig. 4, side view of spiral pinion c. D, threaded feed-screw passjaw;Fig. 5, front view of jaw; Fig. 6, view of ing through a threaded holein the lug d, and cam-lever; Fig. 7, section showing spiral pinthebottom journalingin movableboxd. To the ion and thread on arbor; Fig. 8,section of feed-screwDis secured the spiral pinion. c. D, cutter.cam-lever, pivoted at f; and when forced to My invention relates to asaw-gumming the position represented in Fig. 1, the cam, machine; andconsists in a ring adjustable in operating upon the movable box d,forces jaws, and provided with a carriage or slides, the spiral pinion 0to engage the threads on the same carrying a cross-head and cutter-arthearbor (J. When the tooth of the saw is cut her, and with self feedingmechanism at to the desired depth the outer end of the lever tached; andmy invention further consists ina D comes in contact with the stop D,which screw-thread on the end or ends of the cutterforces the cam-leverto a perpendicular posiarbor to receive the handle. tion, and allows aspring behind the box to There are several saw-gumming machines forcethe same out enough to allow the pinin use at the present time; but allof them ion 0 to disengage the threads on the arbor. have someobjectionable points. In some it cl, screw-thread on the end of thearbor to retakes too much time to place them in the right ceive thehandle. The handle contains a position for operation, and in all caseswhere corresponding thread 01' pin, and when placed the cutter is feddown by hand the feeding is in position to turn the arbor it can move itin irregular consequently the liability of breakbut one direction, andthat is in the direction ing the cutter is great, and some of them canfor the cutter to out; if it is moved in the oponly be adjusted to suita particular kind of posite direction it will soon be disengaged saw. Inall saw-gumming machines where a from the arbor, and by so doing willsave the rotary cutter is used great annoyance is occutter from beingbroken. The machine can casioned by the unintentional backward movebeoperated with one or more handles. ment of thehandle, which, even in theslightest The operation of my machine is as follows: degree, will removea portion of the edge of the When a saw is to be gummed the machine iscutter that comes in contact with the saw, all placed upon the same sothatthe saw occuof which defects are overcome by myimprovepics the slotsc in the jaws A. The set-screws ment in saw-gumming machines, and whichb are forced down upon the saw, so as to hold will be more fullyexplained hereinafter. the machine firmly to the same. The ring A In theaccompanying drawing, A represents is then adjusted in the jaws to thedesired angle the jaws, each provided on one side with the of the toothto be out. When this is accomdovetail groove a, and the lower portion ofthe pli'shed the set-screws b are forced down and jaw provided with theslot at; A, ring prosecure the ring firmly in position. The camvidedwith the flange 0/ upon its periphery, lever D is then placed in theposition repreand a corresponding flange on the inner sursented in Fig.l, which movement forces the teeth on the spiral pinion c to engage thescrew-th read on the arbor O. The handle is then turned in the desireddirection. The threads on the arbor engage the teeth on the pinion c,and cause the same to revolve, which movementrevolves the feed-serew.-The threads on the same, engaging the corresponding threads in the lug(1, cause the same to force the cross-head in the direction required.The arbor containing the cutter, working in boxes secured to thecross-head, must necessarily carry the cutter against the saw. When therequired depth is reached the cam-lever D comes in contact with the stopD, which movement disengages the cam from the movable box cl, and allowsthe same to move enough for the pinion c to disengage the thread of thearbor. The feed-screw D is then turned backward with'the hand, raisingthe cross-head to the required height for the next tooth. The set-screwsb are then loosened, and the machine moved to the next tooth and placedin position, as before.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a saw-gunnning machine, the combination of the ring A, providedwith the flanges a, jaws A, having dovetail grooves a and slots a,carriage-way B, provided with slides a, and cross-head B, arbor G,cutter 0, boxes a",

spiral pinion c, feed-screw D, cam-lever D,

movable box d, lug d, and stop D, when the several parts are arranged tooperate substantially as described, and for the purpose set forth.

2. In a saw-gumming machine, the combination of the rim A, provided withthe flanges a, with the jaws A, having the dovetailed grooves 00 andslots at, said rim A being adapted for adjustment within the jaws A, tosuit the different angles necessary in gumming saws, substantially asdescribed and shown.

3. In a saw-guniming machine, the combination of the arbor O and cutterC with the spiral pinion c, secured near the base. of the feed-screw D,substantially as and for the purpose described.

The above specification signed by me this 28th day of January, 1875.

MARVIN 0. SMITH.

Witnesses:

J. M. SMITH, A. D. HODGE.

